Driving and stopping mechanism



Feb. 3, 1931. V 1 TOPHAM 1,791,176 I DRIVING AND STOPPING MECHANISMFiled March 6, 1926 9 Sheets-Sheet l Feb. 3, 1931'. 1.. E. TOPHAMDRIVING Am) STOPPING MECHANISM 9 Sheets-Sheet 2 ,17 7.; I M MWW FiledMarch 6, 1926 v A f Feb. 3, 1931.

L. E. TOPHAM DRIVING AND STOPPING MECHANISM Filed March 6. 1926 9Sheets-Shee't 5 mess fivemr M 6? 67 14; 4

Feb. 3, 1931. L. E. TOPHAM 1 DRIVING AND STOPPING MECHANISM 9Sheets-Sheet 4 Filed March 6 L; @345 w /u Feb. 3, 1931. L. E. TOPHAM1391,1 1

' muvme AND swormemcnmsu Filed March e; 1926 9 Sheets-Shed 5 mamasfipenior W/wf 7 a aimff Feb. 3, 1931.- E. TOPHAM DRIVING AND STOPPINGMECHANISM Filed March 6, 1926 9 Sheets-Sheet 6 Feb. 3, 1931. TOPHAQM1,791,176

DRIVING AND STOPPING MECHANISM Filed March s, 1926 QSheets-Sheet 7 Feb.3, 1931. E. TOPHAM 39 9 DRIVING AND STOPPING MECHANISM 7 Filed March 6,1926 9 Shets-Sheet "8 jjig jl J.

3,12%6355 I I T I a? 2/?- J/% v 4%??? Feb. 3, 1931. 1.. E. TOPHAMDRIVING AND STOPPING MECHANISM 9 Sheets-Sheet 9 Filed March 6,' 1926Patented Feb. 3, 1931 UNITED STATES:

JERSEY Application filed. March 6,

The invention relates to driving and stopping mechanisms adapted for usein high speed machines.

The object ofthe invention is to provide novel and improved mechanism bywhich a undue shock and wear upon the parts.

Driving and stopping mechanisms have heretofore been devised whichcomprise a high speed driving mechanism for driving a machine ormechanism during its normal oporation, and a slow speed drivingmechanism which is thrown into operation just before the machine is tobe stopped and which acts to drive the machine at a predetermined slowspeed to stopping position.

To secure the results attained by these high and low speed driving andstopping mechanisms, but in a much simpler and more efficient manner, afeature of the present invention contemplates the use of an electricmotor for driving the machine, means for disconnecting the machine andmotor to permit the machine to be finally stopped and means for reducingthe speed of the motor to cause the machine to be driven by the motor ata predetermined low speed prior to the final stopping.

1 As herein shown the invention is embodied in a mechamsm 1n whlchcurrent s supplied to the motor through a high and low speed switch,said switch being moved to low position when the machine isto be stoppedand I being controlled in such a manner that the means for disconnectingthe machine and motor will not be rendered operative until after themachine is being driven at the low speed.

Also, as herein shown, the present invention is embodied in a mechanismin which the slowing down or retardingof the machine from the high tothe low speed is accomplished by the drag on'the armature or rotor ofthe motor due to the alteration in its electroeynamic torque by thechange in the conditions in the motor produced by the shift of theswitch from high to low speed position PATENT OFFICE manner en E.rornnra, or WEnHArr, MASSACHUSETTS, nssienon To UNITED SHOE MACHINERYCORPORATION, or PATERSON NEWJERSEY, AconroRA'rron or NEW DRIVING ANDSTOPPING MECHANISM 1926. Serial No. 92,736.

and thus the necessity of intermediate gearing or brakes such as haveheretofore been used in high and low speed stopping mechanisms to securethis result is avoided.

In. accordance with another feature of the invention, the means fordisconnecting the machine and motor to permit the machine to be fincllystopped is arranged to actin timed relation to a driven shaft of the machine and after at least a predetermined in-- terval ofslow speedconditions in the motor caused by the movement of the switch to lowspeedvposition. 7 y I I Another feature ofthe invention contemplates theprovision of means whereby .as the machine is brought to a stop theswitch is moved again to high speed position so that the motor vruns athigh speed at all times except when .the stopping mechanism is inoperation and no shift from low to high is required in starting.

Other features of the invention consist in the combinations, devices,and arrangement of parts hereinafter described and claimed. Among thesefeatures is a novel and improved clutch actuating and controllingmechanism which is well adapted for use in driving and stoppingmechanisms which donot comprise both a high and a low speed drivingmechanism, as well as in high and low speed driving and stoppingmechanisms which comprise either slow speed gearing or a high and lowspeed electric motor.

7 -The invention together withv the advantages obtained thereby will bereadily understood by those skilled in the art from the followingdescription taken in connection with the accompanying drawings whichillustrate one embodiment of theinvention applied to the machinedisclosed in application ofthe with, the parts being shown in thepositions 7 which they assume when the machine is at rest. Fig. 2 is aright'side elevation of the parts shown in Fig. 1. Fig. 3 is a sectionalplan view of the parts shown in Fig. 1. Fig. 4 is a detailed front viewpartly in section of a portion of the mechanism shown in Fig. 1, butwith the parts in the position they assume when the machine is running.Fig. 5 is a right side elevation of certain of the parts shown inFigs. 1. and i. Fig. 6 is a left side elevation of certain portions ofthe stopping mechanism including the high and low speed switch and itscontrolling mechanism with the machine in rest position. Fig. 7 is adetailed front elevation of certain portions of the stopping mechanismwith the parts in the positions they assume immediately after themechanism is thrown into operation by the elevation of the control intoengagement with its actuating lever. Fig. 8 is a. right side elevationof certain of the parts shown in Fig. 7. Fig. 9 is a front elevation. ofthe same parts showing the control bar further advanced and with theslow speed switch thrown in. Fig. 10 is a right side elevation ofcertain of the parts as shown in Fig. 9. Fig. 11 is afront elevation ofthe parts illus trated in Fig. 9 showing the control bar advanced tothrow into operation the mechanism by which the clutch is thrown out andthe brake set to bring the machine to its final stop. Fig. 12 is a rightsideelevation of certain of the parts as shown in Fig. 11. Fig. 13 is adetailed front elevation of parts of the stopping mechanism advancedslightly beyond the positions indicated in Figs. 11 and 12 andillustrating particularly the mechanism for disengaging the control barfrom its actuating lever. Fig. 1 1 is a right side elevation of certainof the parts, including the high and low switch, in the position shownin Fig. 13. Fig. 15 is a detailed front view of the parts shown in Fig.18 with the control bar at the limit of its advancing stroke and aboutto return to starting position. At this time the switch has returned tohigh speed position. Fig. 16 is a right side elevation of parts of thehigh and low switch mechanism prior to the return of the control bar andwith the switch in, high speed position.

The driving and stopping mechanism hereinafter specifically describedincludes a main driving shaft, an electric motor connected theretoadapted to be driven at high or low speed, sleeve loosely mounted on theshaft and arranged to be connected thereto by a friction clutch andgearing connecting the sleeve with the cam shaft of the machine which isto be driven. A flange formed on the upper end of the sleeve carries oneface of the friction clutch which is adapted to enga e a correspondingclutch member formed on the driving shaft. A heavy spring bearingagainst the lower end of the sleeve tents to hold the clutch members inengagement. The sleeve is also adapted to cooperate with the stationarymember of a friction brake so that when the sleeve is forced downwardagainst the pressure of its spring the clutch is disengaged and thebraling surfaces are brought into contact to stop the machine. A camgroove formed in the sleeve and adapted to engage lock bolt carried onone end of a bell crank lever forms a convenient means for controllingthe position of the sleeve.

The high and low switch for controlling the speed of the motor comprisesa switch lever adapted to swing between the high and low speed positionsand actuated by means of a switch cocking device which is set to swingthe switch lever to the low speed position when the machine is started,and is set to return the switch lever to the high speed position whenthe clutch is thrown out in stopping the machine. At all times exceptwhen the stopping mechanism is in operation, the switch is locked inhigh speed position against the pull of the switch cocking device.

The operation of the switch mechanism and the clutch and brakingmechanism is controlled and coordinated by means of a control bar whichis actuated, when thrown into operation, by means of a levercontinuously oscillated from a cam groove in the clutch sleeve. To stopthe machine the oscillating lever is operatively connected to thenormally inactive control bar which is lifted by successive steps andacts first to throw the motor into slow speed and then after about tworevolutions of the cam shaft to throw into operation mechanism fordisconnecting the clutch and applying the brake. As the machine stopsthe motor is again returned to high speed and the control bar permittedto drop back to its original inoper ative position.

Referring to the drawings, a shaft, indicated at 18 has loosely mountedthereon a sleeve 20 which is directly connected to the cam shaft of themachine through a spiral gear 22 mounted on the sleeve and a similargear on the cam shaft. A flange 24- formed on the upper end of thesleeve carries one face of a conical friction clutch the other member ofwhich, indicated at 26, is mounted on said shaft 18 which is driven fromthe electric motor through a pinion formed on the lower end of thearmature shaft 19 of the motor which meshes with an internal gear formedon an upward extension of the clutch member 26. A heavy compressionspring 28 hearing against the lower end of the sleeve tends to hold theclutch members in contact. The outer surface of the flange 24 forms onemember of a friction brake, the opposing surface. indicated at 29, beinglined in the machine frame. It will be seen that as the sleeve is moveddownward against the pressure of the spring 28 the clutch is disengagedand the braking surfaces are brought into contact to bring the sleeveand cam shaft connected thereto to a stop. p

The mechanism for disengaging the clutch and applying thebrake to stopthe'cam shaft at the proper time comprises a cam groove.

formed in the sleeve 20 and arranged to be engaged by a lock bolt 32slidably mounted in a sleeve 34 on one arm of a belljcrank lever 36which is mounted on a rock shaft 38. A spring 40 coiled about the lockbolt inside the sleeve 34 with one end resting against a shoulder in thesleeve and the other end bearing against a shoulderon the lock bolttends to hold the lock bolt in engagement with the cam groove. When themachine is at rest as in Figs. 1, 2 and 3, the bell crank lever, actingin conjunction with the cam groove 30, is held in a position to hold thesleeve 20 downward against the pressure of its spring with the clutchreleased and the brake set by means of a latch lever 44 which is notchedto engage the lower end of the bell crank lever 36. A

compression spring 46 tends to hold'the latch lever in locking position.

For starting the machine; mechanism is.

- of the lever 52 and at its lower end slidably mounted in the machineframe. The lever 52 is pivoted at 54 and is connected by means of a pinand slot connection'56 at its other end to the vertical bar 58 forcooking the high and low speed switch. When the machine is at rest, thespring 60 stretched from the'rod 48 to a point on the machine frameholds the rod in an elevated position, the upward movement being limitedby theengagement of a nut 62 on the lower end of the rod with aprojection on the machine frame. Two parallel arms 64 extend downwardlyfrom the hub of lever 52 into engagement with the shoulder 42 onthe rearend of the lock bolt 82 so that by depressing the rod the lock bolt maybe withdrawn from the cam groove in the sleeve to permit the engagementof the clutch. The rod 48 is depressed by the operator to start themachine either by means of a hand lever 63 pivoted at 65 on the frameand connected at 6? by a pin and slot connection to the rod, or by afoot treadle through connections which include the plunger 69 and anglelever 71 pivoted at 73 to the frame The rod is then held'in itsdepressed position by the engagement of a latch lever 66 mounted on themachine frame and pressed downwardly by the action of its spring 68 witha catch 70 on the upper part of lever 52.

When the rod 48 is depressed to start the machine a block 72 adjustablymounted on the rod is brought into contact with and depresses the latchlever 44 to re lease the bell crank 36which is then turned about itspivot by the spring 74 stretched uetween tne lower arm of the lever anda point on the machineframe. The exact posi the frame.

From this p tion of the bell crank lever and the lock bolt whileth'e'machine is running is determined by an adjustable screw 76 in thelower arm of the lever which engages an abutment 78 on The control barof the stopping mechanism is ac uated when the stopping mechanism isthrown into operation by means of a lever 80 pivoted at 82 on themachine frame and continuously oscillated by the engagement of the roll84 mounted on one end of the lever with the cam groove '30 in the clutchsleeve.-

It pawl 86 is mounted to slide in arecess in the other end of the lever80, and 1s thrust -into"engagcmentwith the stopping mecha-' nism controlbar 88 by means of a spring 90 wrapped around the shank of the pawl inthe recess and lit-earingagainst a shoulder 92 on the pawl. To preventthe pawl from turning in its r cess, the pawl is equipped'with two pins94 which project through slots 96 in the lever 80. lhecentrol bar 88 ismounted to slide vertically in the machine frame-in brackets 104 and 106and has three notches indicated at 108 to be by the pawl 86 ofthe'actuating lever 80. Normally thefcontrol'bar 88 is held in itslowest position by means of a spring 110 tastened/at one end to a pin112 on the bar ai'uil the other end to a projection 114 on V the bracket106 so that the pawl 86is' out of engagement with the notches andrideson a smooth portion of the bar. The lower extremity of the bar isin the form of awedge to engage a V shaped holder 116 on one end of thelever 118.

The stopping mechanism of the machine is thrown into operationautomatically by means more fully disclosed in application, Serial No.312,366 hereinbefore referred to, acting through intermediateconnections including the link 120 and lever 122 to move the lever 118one way or the other causing the control bar to slide up thein'clinedsurface of the holder 116 so that the upper notch 108 isbrought into a position to be engaged by the pawl 86 onthe oscillatinglever 80. it the control bar is raised step by step to p orni thevarious operations'to stop the ma'c after which itis released "from its9.051151tlIlQnlQCllMllSn] and permitted to drop again to its originalposition. To prevent the bar from sliding back during each retractingstrolre of the actuating lever 80,

a pawl 124 is pivotally mountedat 126 on the frame of the machine toengage successively the notches 128+1nd 130 fornied in the control bar.A sprir fastened at one end to a pin 184 on thepawl and'at the other endto the machine fraine normally holds the pawl in operative position. Anarm 136 formed on the hub of the pawl'l24 is adapted slide in a recess138 out inthe control bar,

and is also connected at 140 to the lower end of a. link 142 which ismounted at its upper end to slide between a stationary pin 14:4 and apawl releasing device 145 consisting of a bail shaped member pivoted onthe frame and provided with fingers projecting downwardly in front ofthe laterally projecting pins 94 of the pawl 86. As the control bar israised to its most advanced position, the arm 136 comes into contactwith the lower end of the recess and is turned about the pivot 126swinging the pawl away from the control bar and causing the link 1&2 towedge the pawl releasing device 145' outward to release the control barfrom the influence of the pawl 86 mounted in the actuating lever 80. Asthe control bar drops to its original position, the arm 186 engages theupper end of the recess 188 and is swung downward returning the pawl12-4 and the link 142 to their first positions.

The electric motor for driving the machine, the armature shaft of whichmotor is indicated at 19 may be of any usual or well known constructionwhich adapts it to run at either a high or a low speed. Also except forits controlling and actuating mechanism the high and low speed switchfor the motor may be of any usual or suitable construction. A. type ofmotor and arrangement of high and low speed switch contacts which may beused is disclosed in applicants pending application for a driving andstopping mechanism filed September 24, 1925, Ser. No. 58,352. In theconstruction illustrated in the drawings, the high and low speed switchcomprises an actuating arm or lever 146 secured to the inner end of ashaft 148 the outer end of which carries the movable contact or contactsof the switch arranged to cooperate with the stationary contacts. Thearm 146 is provided with a crosspiece 150 formed on its lower end andhaving right angled extensions at its extremities to engage the high andlow speed stops 152 and 154: respectively and cooperate with pins 156 onthe control bar 88 as will be described.

A switch cocking device is provided consisting of a lever arm 158mounted on the pivot 160 in the machine frame and controlled by a gearsegment 162 formed on the hub ofthe arm 158 and a rack 164i on theswitch cock bar 58. A tension spring 166 is stretched between the switchcocking arm 158 and a pin 168 on the switch lever 1 16 to exert therequired pull to cock the switch.

lVhen the rod 48 is depressed to start the machine the lever 52 isturned about its pivot to raise the switch cock bar 58 and cause thelever arm 158 to swing about its pivotand exert the desired pull tendingto swing the switch to low speed position.

In operation the control bar 88 acts in conjunction with the actuatinglever 80 a timing device to switcn the motor into slow speed and thenafter a predetermined period to throw into operation the clutchreleasing and braking mechanism. The posi tion of the parts at the endof the first step in the cycle of operations immediately after thecontrol bar has been lifted into engagement with the lever and pawl 86is illustrated in Figs. 7 and 8 of the drawings.

During the first effective stroke of the actuating lever 80 after thecontrol bar has been lifted as illustrated in Figs. '4' and 8, the upperpin 156 is withdrawn from the path of the switch lever which is thenpermitted to spring into contact with the low speed terminal under theinfluence of the switch cocking device. The changed conditions whichresult in the motor alter the electro-dynamic torque so as to produce abraking or retarding effect which operates quickly and smoothly toreduce the machine to the desired low speed. In Figs. 9 and 10, theparts of the stopping mechanism are shown in their relative positionsafter the completion of this operation when the motor is running at slowspeed and the actuating lever 80 has begun its second upward stroke.

The second stroke of the lever 80 raises the upper end of the controlbar 88 into contact with the latch lever 66 to lift it out of engagementwith the catch 70 and set in motion the clutch and braking mechanism. Atthe same time the lower pin 156 on the control. bar is lifted into thepath of the switch lever looking it for the moment in low speedposition. The lever 52 and rod 4-8 released from the control of thelatch lever are free to move under the influence of spring into restposition releasing the lock bolt 3:2 and latch lever l so that the bellcrank lever 36 and cam groove 30 will cooperate to throw out the clutch.and apply the brake in the manner hereinafter described. The switch cockbar 58 fastened to the end of lever 52 is moved downward to cock theswitch exerting a tension to return it to high speed position. Therelative positions of the parts at this time is shown in Figs. 11 and 12with the actuating lever 80 about to begin its next effective stroke.

The third effective stroke of the lever raises the control bar to itsmost advanced position lifting the lower pin 156 out of the path of theswitch lever 146 to allow it to return to high speed position and at thesame time operating the devices for disconnecting the control bar fromits aetuat. mecha- (See Figs. 13, 14. 15 and As the control bar is:lifted, the lower end of the slot 138 in the bar is brought in contactwith the arm 136 and acts to turn it about its pivot to throw the pawl124 away from the control bar and also to raise the link 142 causing thepawl 86 in the end of the actuating lever 80 to be forced out of contactwith the control bar. The control bar is now drawn down by its spring110. As the bar reaches its original inoperative position, the

upper end of the slot 138 engages and turns the lever arm 136 about itspivot so that the awl 124 is swung back into contact with the barv andthe link 142. retracted to permit the pawl86 to ride again on the smoothportion of the ban w The manner in which the'bell crank lever '36 andcam groove cooperate to throw out the clutch and apply the brake will bereadily understood from an inspection of Figures 1, 3, 5, and 6. lVhilethe machine is running, theparts are in the positions illustrated inFigures 3, 4, and 5,. with the lock bolt 32 out of engagement with thecam groove, which position of the lock bolt may be termed itsnormalposition. When the, latch lever 66 is moved out of engagement withthe catch 7 O, the rod 48 is allowed to move upwardly and thereby thelatch lever 44, best shown in Figure 5, is allowed to rest against thelower end of the vertical arm of the bell crank lever 36. Also, as therod 48 moves upwardly, the lever 52 is swung in a counter-clockwisedirection and its arms 64' release the lock bolt 32 so that thelockboltis pressed towards the left, asviewed in Figures 3 and 4, by'the spring40. The end of the lock bolt 32 bears against the'sleeve 20 and as thesleeve with its cam groove 30 continues to rotate, a portion of the camgroove will be caused to reg-V ister with the lock bolt which will beforced into the cam groove. As'the sleeve with'its cam groove continuesits rotation, the bell crank lever 36 carrying the loolrbolt will beactuated so that its vertical arm is moved towards the-left, as viewedinlFigure 5. This movement towards the left will permit the latchlever44 to move upwardly so that its shoulder will be in a position toengage the lower end of the bell crank upon its return movement. As thesleeve with its cam groove 3Qcontinues its rotation, the movement of thebell crank lever 36 will be reversedand before this reverse movement iscompleted, the movement of the bell crank will be stopped by theengagement of the lower end of the vertical arm of thebell crank withtheshoulder of the latch 44, The bell crankwill now be held stationary,and duringthe continued rotationof the sleeve20 with its cam groove 30the sleeve will be movedbodily in an axial direc tion against the forceofthe spring 28, (see- Figure 1) soasto disengage the clutch members 24and 26. I 7 To enable the stopping mechanism to be thrown into operationmanually, a lever 170 is pivotally mounted on the frame of the machineand is provided at one end with a handle and at the other end with asurface arranged to engage the lower pin 156 on the controller bar andlift the bar when the lever is actuated manually against thetension ofits retracting spring 17 2. Thenature and object of the presentinvention having been indicated and a mechanism what is'claimed is: 1

- ing, in

I driventhereby, means for supplying current embodying'the severalfeatures ofthe invention having I been specifically described,

1. A driving and stoppingmechanism having, in combination, an electricmotor, means for supplying current to the motor, a shaft driven by themotor, means'forreducing the speed of the motor to cause the driven at apredetermined low speed and means for thereafter disconnecting the shaftfrom the motor. a c r 2. A driving and stopping mechanism having, incombination, an electric motor, means for supplying current to themotor, means for changing the conditions in the motor to alter itselectrodynamic torque and means for thereafter disconnecting the shaftfrom the motor. 7

3. A driving and stopping mechanism'havring, in combination, an electricmotor, means for supplying current. to themotorincluding a high and lowspeed switch, means for movingthe switch from high to low speed positionand means acting automatically at least a predetermined interval afterthe move 5;

ment of the switch'to'low speed position to disconnect-the shaft fromtheimotor.

4 A driving-andstopping-mechanism having, incombination, an electricmotor, means for supplying current to the motor,'a shaft driven bythemotor, means rendered; operative in stopping the, machine for changingthe conditions in-the motor to alter its electrodynamic torque, andmeans acting automatically thereafter from the motor.

to disconnect the shaft shaft to be 5,. A driving and stopping mechanismhavto alter the 6. A driving and stopping mechanism having, incombination, an electric motor, a shaft driven thereby,

and after at least a predetermined period of low speed conditions todisconnect the shaft. 7. A driving and stopping mechanism having, incombination, anelectric'motor, a shaft driven thereby, means forsupplying current to the motor, means for changing the conditions in themotor to cause it'to runat a high or low speed, and means acting intimed relat-ionto'the angular position of the shaft and after thechangeeto low speed conditions to disconnect the shaft. r

8. A driving and stopping mechanism havcombination, an electric motor, ashaft to the motor including a switch, means acting operation to I andmeans acting aumeans for changing the con 1 dltions 1n the motor tocause t to run at when thrown into operation to operate the switch tocause the motor to operate at slow speed and means acting automaticallywhile the motor is operating at slow speed to stop the shaft.

9. A driving and stopping mechanism having, in combination, an electricmotor, a shaft driven thereby, means for supplying current to the motorincluding a high and low speed switch, means actuated by the shaft andacting when thrown into operation to move the switch from high to lowposition and after a predetermined the shaft.

10. A driving and stopping mechanism having, in combination, an electricmotor, a shaft driven thereby, means for supplying current to the motorincluding a high and low speed switch, means actuated by the shaft andacting when thrown into operation to move the switch from high to lowposition and thereafter to disconnect and stop the shaft.

11. A driving and stopping mechanism having, in combination an electricmotor, a shaft driven thereby, means for suppl ing current to the motorincluding a high and low speed switch, an actuating lever for thestopping mechanism continuously operated in timed relation to the shaft,mechanism acting when operatively connected to the actuating lever tothrow the switch into low speed and thereafter to disconnect and stopthe shaft, and meansfor causing this mechanism to be engaged by theactuating lever to stop the machine' 12. A driving and stoppingmechanism having, in combination, an electric motor, a shaft driventhereby, means for supplying current to the motor including a high andlow speed switch, an actuating lever for the stopping mechanismcontinuously operated in timed relation to the shaft, a control barnormally inactive, and means for causing the actuating lever to movethecontrol bar to change the switch to low speed and thereafter todisconnect and stop the shaft.

13. A driving and stopping mechanism having, in combination, an electricmotor, a

shaft driven thereby, means for supplying current to the motor includinga high and low speed switch, a clutch and braking mechanism for theshaft, a control bar acting when actuated to change the switch to slowspeed position and after a predetermined period to set in motion theclutch and braking mecha nism' to stop the shaft, and thereafter toreturn the switch to high speed position and means for actuatingthe'control bar.

14. A driving and stopping mechanism having, in combination, an electricmotor, a shaft driven thereby, means for supplying current to the motorincluding a high and low speed switch, 'a'clutch and braking mechanismfor the shaft, a control bar acting when actuated to change the switchto slow speed period to disconnect and stop,

position and after a predetermined period to set in motion the clutchand braking mechanism to stop the shaft, and means for actuating thecontrol bar.

15. A driving and stopping mechanism having, in combination, an electricmotor, a shaft driven thereby, means for supplying current to the motorincluding a highand low speed switch normally set at high speed, aclutch and braking mechanism, a switch cocking device, means acting whenthe clutch is thrown in in starting the machine to cock the switch forlow speed and thereafter when the clutch is thrown out in stopping themachine to cock the switch for high speed, a control bar actingwhenthrown into operation to permit the switch to move to slow speedposition, and thereafter to cause the clutch and braking mechanism tostop the shaft and finally to permit the switch to return to high speedposition and means for actuating the control bar. 16. A driving andstopping mechanism having, in combination, an electric motor, a shaftdriven thereby, means for supplying current to the motor including ahigh and low speed switch, an actuating lever continuously oscillated intimed relation to the shaft, a switch cocking device, a control baracting when operatively connected'to the actuating lever to permit theswitch to move to slow speed position and thereafter while the motor isoperating under low speed conditions to disconnect and stop the shaft,and finally to permit the switch to return to high speed position andmeans rendered active in stopping the machine to cause the control barto be actively connected to its actuating lever.

17. A driving and stopping mechanism having, in combination, a shaft,driving mechanism therefor, means for discennecting the drivingmechanism from the shaft comprising a rotatable and axially movable camacting during its axial movement in one direction to disconnect thedriving mechanism from the shaft and during its movement in the oppositedirection to connect the driving mechanism with the shaft, a spring formoving the cam axially to' connect the driving mechanism with the shaft,a member nor 'mally disconnected from the cam, means for connecting saidmember to the cam to cause the member to be shifted first in onedirection and then. in the reverse direction r the cam, and means forstoppin the rc ersc movement of said member before it reaches itsinitial position to cause the cam to be moved axially during thecontinued rotation of the cam to disconnect the dris-ing mechanism fromthe shaft.

'18. A driving and stopping mechanism having, in combination a (l1l\ rigclutch member, a driven clutch member, a cam rotated by the drivenclutch member and a2;-

ially movable in opposite directions to move the driven clutch memberinto and out of en gagement with the driving clutchn'iember, a springfor moving the cam axially to engage the clutch members, a membernormally disconnected from the cam, means for connecting said member andcam to cause said member to be shifted first in one direction and thenin the reverse direction by the cam, and a pawl for stopping the reversemovement of said member before it reaches its initial position to causethe cam to be moved axially during the continued rotation of the cam todisengage the clutch members.

19. A driving and stopping mechanism having, in combination, a crivingclutch member, a driven clutch member, a cam rotated by the drivenclutch member and axially movable in opposite directions to move thedriven clutch member into and out of engagement with the driving clutchmember, a spring for moving the cam axially to engage the clutchmembers, a member normally disconnected from the cam, means forconnecting said member and cam to cause said memher to be shifted firstin one direction and then in reverse direction by the cam, a pawl forstopping the reverse movement of said member before it reaches itsinitial position to cause the cam to be moved axially during thecontinued rotation of the cam to discngagethe clutch members, andtreadle controlled means ior actuating the pawl to release said member.

20. A driving and stopping mechanism having, in combination, a drivingclutch member, a driven clutch member, a cam rotated by the drivenclutch member and axially movable in opposite directions to move thedriven. clutch member into and out of engagement with the driving clutchmember, a

spring for moving the cam axially to engage the clutch members, amembernormally disconnected from thecam, means for connectmg said member andcam to cause sald member to be shifted first in one direction and thenin the reverse direction by the cam, a

7 pawl for stopping the reverse movement of comprising a rotatable andaxially movable cam acting during its axial movement in one direction todisconnect the drivlng niechanism from the shaft, a locking boltcarrier, a lock bolt on the carrier normally out of engagement with thecam, and means for moving the locking ibolt into engagement with the camto cause the cam to be moved axially during the continued rotation, ofthe cam to disconnect the driving mechanism from the shaft. I v

22 A driving and stopping mechanism having, in combination, a drivingclutch member, a driven'clutch membena cam rotated by the driven clutchmember andaxially movable in opposite directions to move the drivenclutch member into and out of engagement with the driving clutch memher,a lock bolt carrier, a locking bolt on the carrier normally out ofengagement'with the cam, and means for moving the locking bolt intoengagement with the cam to cause the cam to be moved axially during thecontinued rotation of the cam to disengage the clutch members.

'23. A driving and stopping, mechanism having, in combination, a drivingclutch 7 member, a driven clutch member, a cam rotated by the drivenclutch member and axially movable in opposite directions to move thedriven clutch member into and out of engagement with the driving clutchmember, a spring for moving the cam axially to ei'igage the clutchmembers, a lock bolt carrier, alocking bolt on the carrier normallydisconnected from the cam, means for moving the locking bolt intoengagement with the cam to cause the lock bolt carrier to be shiftedfirst in one direction and then in the reverse direction by the cam, anda pawl for stopping the reverse move- ,ment of the lock bolt carrierbefore it reaches its initial position to cause the cam to be movedaxially during the continued rotation of the cam to disengage the clutchmembers.

24. A driving and stopping mechanism having, in combination, a drivingclutch member, a driven clutch member, acam. rotated by the drlvenclutch member, and

axially movable in opposite directions to move the driven clutch memberinto and out of engagement with the driving clutch member, a clock boltcarrier, a' locking bolt on the carrier normally out of engage ment withthe cam, means for moving the locking bolt into engagement with the camto cause the cam to bemoved axially during the continued rotation of thecam to disengage the clutch members, and treadle con-. trolled means forwithdrawingthe locking. bolt from the cam.

, 25. A driving and stopping mechanism having, in combination, a drlvingclutch member, a driven clutchj member, a cam rotated by the drivenclutch member and axially movable in opposite directions to move thedriven clutch member into and out of engagement with the driving clutchmember, a spring for moving the cam axial- .ly to engage the clutchmembers, a lock bolt carrier, a'locking bolt on the carrier normallydisconnected from the cam, means for moving the looking bolt into engagenient with the 0am to cause the lock bolt carrier to be shiftedfirst in one direction and then in the reverse direction by the can], apawl for stopping the reverse movement of the lock bolt carrier beforereaches its initial position to cause the (321111 to be moved axiallyduring the continued rotation of the cam to disengage the clutchmembers, and treadle controlled means for Withdrawing the locking boltfrom the cam and for actuating the pawl to release the look boltcarrier.

In testimony whereof I have signed my name to this specification.

LAURENCE E. TOPHAM.

